Rob Conner wrote:
> No you don't need to know Zope to help me. The whole reason I'd even
> want to do this is because of Zope though. I made a Zope product, and
> now want to perfect it.
>
> some simple example code...
>
> <code>
> class User:
>
> def View(self):
> # play with data here
> myHtmlDoc = "pretend this is a uper profile"
> return myHtmlDoc
> index_html = View
>
> def Edit(self):
> # play with data here
> myHtmlDoc = "editing the user"
> return myHtmlDoc
> </code>
>
> So when visiting "website.com/User" zope will call User.index_html() or
> when you visit "website.com/User/View" zope will call User.View() In
> all of the testing/learning I've done on Zope I'm pretty sure that last
> item (index_html or View) must be a method,
Anything that returns HTML is ok. Can be a method, a data attribute, a
class attribute pointing to a ZPT or DTML file (like you do for ZMI
forms), and even any aquired component ! (the view and index_html
attributes doesnt need to live in the class...)
>
> The problem comes when I want to have code put into every method.
> Perhaps a counter I want to increment on every visit to a User page.
> I can do this..
>
> <snippet>
> def View(self):
> incrementCounter()
> # play with data here
> myHtmlDoc = "pretend this is a uper profile"
> return myHtmlDoc
> index_html = View
>
> def Edit(self):
> incrementCounter()
> # play with data here
> myHtmlDoc = "editing the user"
> return myHtmlDoc
> </snippet>
>
> ... but in reality in my real code that one counter increment line ends
> up being 20 lines long.
This is typically what AOP is all about - and Python offers a quite
usable support for "ad hoc" aspects, via the function wrapper idiom. The
simplest way is to use closures:
def wrapper(fun, wargs):
def wrapped(fargs):
do_something_before_funcall(wargs, fargs)
res = fun(fargs)
do_something_after_funcall(wargs, fargs)
return res
return wrapped
class Machin(object):
def to_be_wrapped(self, args):
# code here...
# Zope 2.x uses Python 2.3.x, so no @decorator syntax
to_be_wrapped = wrapper(to_be_wrapped, wargs)
If you need something more complex, see Sam's example with a callable
object.
(snip longer code exemple)
--
bruno desthuilliers
python -c "print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in '[EMAIL PROTECTED]'.split('@')])"
--
http://mail.python.org/mailman/listinfo/python-list
